Aiken, Andrew, fl1819 (Secretary to the Royal Society of Arts)
Found in 3 Collections and/or Records:
Eight letters from Cragg concerning his proposal for finding longitude by a ship's reckoning using a compass and charts, without the assistance of celestial lights or books of calculation. Includes charts for sailing [RGO 14/39: 53] and [RGO 14/39: 68v].
Concerning longitude and enclosing a chart.
Concerning his theories on finding longitude.